RE: Corrosion - The frame is steel, the screws are steel, only Al is the belly skin. The reflectix will isolate the skin from the frame. Put a plastic washer under the screw head and use some thread-lock.
That said, I have no experience with thread-lock on coarse thread screws like sheet metal screws, but there are lots of self drilling sheet metal screws under my trailer holding on cables, propane lines and such. To my knowledge none have backed out. Thread-lock would be good insurance.
Al
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Al, K5TAN and Missy, N4RGO WBCCI 1322
2002 Classic 30 Slideout -S/OS #004
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
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